Observation of $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ final states

Abstract

The first observation of the $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays is reported using a sample of proton-proton collisions collected by LHCb at a center-of-mass energy of 8TeV, and corresponding to 2fb${}^{-1}$ of integrated luminosity. The corresponding branching fractions are measured using as normalization the decay $D^0\to K^{-}{\pi }^{+}[{\mu }^{+}{\mu }^{-}{]}_{{\rho }^0/\omega }$, where the two muons are consistent with coming from the decay of a ${\rho }^0$ or $\omega$ meson. The results are $\mathcal{B}(D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-})=(9.64\pm 0.48\pm 0.51\pm 0.97)\times 10^{-7}$ and $\mathcal{B}(D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-})=(1.54\pm 0.27\pm 0.09\pm 0.16)\times 10^{-7}$, where the uncertainties are statistical, systematic, and due to the limited knowledge of the normalization branching fraction. The dependence of the branching fraction on the dimuon mass is also investigated.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-019.html

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